在php中验证表单 [英] validate a form in php

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本文介绍了在php中验证表单的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

你好，我试图在PHP中验证一个表单。当我必须检查必要的字段时工作正常。但是检查正确的电子邮件格式它显示错误但是在表单提交后。如何纠正这个？这是代码



 <  ！DOCTYPE     HTML  >  
 <   html  >  
 <   head  >  
 <  样式 >  
 .error {color：＃FF0000;} 
 <   / style  >  
 <   / head  >  
 <  正文 >  
 
 <？  php   
   
   //     define    变量   和    set     to    空   值  
   
   $ nameErr     =   $ emailErr   =   $ genderErr   =   $ websiteErr   =   $ emailErr1 =  ;   
   
   $ name     =   $ email   =   $ gender   =   $ comment   =   $ website   =  ;   
   
   
   
   if    （$ _ SERVER [REQUEST_METHOD]     =   =  POST）  
   
   {  
   
   
   
         if    （空（$ _ POST [name]））  
   
             {$ nameErr  < span class =code-summarycomment>   = 名称是必需的 ;}   
   
  < span class =code-summarycomment>       else   
   
             {$ name     =   test_input（$ _ POST [  name]）;}   
   
   
   
         if    （空（$ _ POST [email]））  
   
             {$ emailErr     = 需要电子邮件 ;}   
   
      < span class =code-summarycomment>   else   
   
             {$ email     =   $ _ POST [  email];   
   
         if    （！preg_match（/（[\\  -   - ] + \ @ [\ w \  - ] + \。[\\\\  - ] +）/，$ email））  
   
       {  
   
       $ emailErr1     = 无效的电子邮件格式 ;   
   
      }   
   
    }   
   
   
   
    < span class =code-summarycomment>     if    （空（$ _ POST [网站]））  
   
             {$网站    =  ;}   
   
         else   
   
             {$ website     =   test_input（$ _ POST [  website]）;}   
   
   
   
         if    （空（$ _ POST [comment]））   
   
             {$ comment     =  ;}   
   
         else   
  < span class =code-summarycomm ent> 
             {$ comment     =   test_input（$ _ POST [  comment]）;}   
   
   
   
         if    （空（$ _ POST [gender]））  
   
             {$ genderErr     = 性别是必需的 ;}   
   
         else   
   
             {$ gender     =   test_input（$ _ POST [  gender]）;}   
   
  }   
   
   
   
   function     test_input（$ data）  
   
   {  
   
             $ data     =   trim（$ data）; 
   
             $ data     =  的stripslashes（$数据）; 
   
             $ data     =  用htmlspecialchars（$数据）; 
   
             return     $ data;   
   
  }   
   
  ？ >  
 
 <   h2  < span class =code-keyword>>  PHP表单验证示例<   / h2  >  
 <   p  >  <   span    类  = 错误 >  *必填字段。<   / span  >  <   / p  >  
 <  表格   方法  =  post     action   =  <？php echo htmlspecialchars（$ _ SERVER [  PHP_SELF]）;？ > > 
名称：<  输入   类型  =  text    name   = 名称 >  
 <   span     class   =  错误 >  * < ？  php     echo  < span class =code-summarycomment>   $ nameErr;？ >  <   / span  >  
 <   br  >  <   br  >  
电子邮件：<  输入 < span class =code-attribute>   type   =  text    name   =   email >  
 <   span    类  = 错误  >  * <？  php     echo     $ emailErr; echo     $ emailErr1;？ >  <   / span  >  
 <   br  >  <   br  >  
网站： <  输入    type   =  text    name   = 网站 >  
 < span class =code-keyword><   span     class   =  error >  <？  php     echo     $ websiteErr;？ >  <   / span  >  
 <   br  >  <   br  >  
评论：<   textarea     name   =  comment   行  =  5    cols   =  40 < span class =code-keyword>>  <   / textar ea  >  
 <   br  >  <   br  >  
性别：
 <   input     type   =   radio   名称  = 性别    value   =  female > 女性
 <  输入    type   =  radio    name   =  性别    value   = 男性 > 男性
 <   span     class   = 错误 >  * <？  php     echo     $ genderErr;？ >  <   / span  >  
 <   br  >  <   br  >  
 <  输入    type   = 提交   名称  = 提交    value   = 提交 >  
 <   / form  >  
 
 <？  php   
   
   echo    < h2  > 您的输入：<   / h2  > ; 
 echo $ name; 
 echo<   br  > < /跨度>; 
 echo $ email; 
 echo<   br  > < /跨度>; 
 echo $ website; 
 echo<   br  > < /跨度>; 
 echo $ comment; 
 echo<   br  > < /跨度>; 
 echo $ gender; 
？> 
 
 <   / body   >  
 <   / html  >

解决方案

nameErr =


emailErr =


genderErr =

hello i am trying to validate a form in php. It is working fine when i have to check for required field.But on checking for correct email format it is showing error but after the form gets submitted.How to correct this?Here is the code

<!DOCTYPE HTML>
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>

<?php

// define variables and set to empty values

$nameErr = $emailErr = $genderErr = $websiteErr =$emailErr1= "";

$name = $email = $gender = $comment = $website = "";



if ($_SERVER["REQUEST_METHOD"] == "POST")

{



   if (empty($_POST["name"]))

     {$nameErr = "Name is required";}

   else

     {$name = test_input($_POST["name"]);}



   if (empty($_POST["email"]))

     {$emailErr = "Email is required";}

   else

     {$email =$_POST["email"];

   if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))

  {

  $emailErr1 = "Invalid email format";

  }

 }



   if (empty($_POST["website"]))

     {$website = "";}

   else

     {$website = test_input($_POST["website"]);}



   if (empty($_POST["comment"]))

     {$comment = "";}

   else

     {$comment = test_input($_POST["comment"]);}



   if (empty($_POST["gender"]))

     {$genderErr = "Gender is required";}

   else

     {$gender = test_input($_POST["gender"]);}

}



function test_input($data)

{

     $data = trim($data);

     $data = stripslashes($data);

     $data = htmlspecialchars($data);

     return $data;

}

?>

<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
   Name: <input type="text" name="name">
   <span class="error">* <?php echo $nameErr;?></span>
   <br><br>
   E-mail: <input type="text" name="email">
   <span class="error">* <?php echo $emailErr;echo $emailErr1;?></span>
   <br><br>
   Website: <input type="text" name="website">
   <span class="error"><?php echo $websiteErr;?></span>
   <br><br>
   Comment: <textarea name="comment" rows="5" cols="40"></textarea>
   <br><br>
   Gender:
   <input type="radio" name="gender" value="female">Female
   <input type="radio" name="gender" value="male">Male
   <span class="error">* <?php echo $genderErr;?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit">
</form>

<?php

echo "<h2>Your Input:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>

</body>
</html>

解决方案

nameErr =


emailErr =


genderErr =


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